The question of ______ the traffic accident happened hasn’t been answered yet, t

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问题 The question of ______ the traffic accident happened hasn’t been answered yet, though the police have made on-the-spot investigation.

选项 A、that
B、whether
C、how
D、whenever

答案 C

解析此句中，由关系词引导的从句作介词of的宾语；两者一起构成的介词短语又用来修饰前面的名词“the question”。从句意上我们可以判断出，空白处缺少一个表示方式的关系副词how。选项whenever意思是“无论何时，随时”。

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